Question

Matt is measuring the length of bacterialcells. The first 8 cells that he measures are 3micrometers. The next 12 cells that he measuresare 2 micrometers. What is the average length inmicrometers of the bacterial cells that Matt haslooked at?A. 2.2B. 2.25C. 2.3D. 2.4E. 2.5

Answer 1

Matt measures 8 cells in with micrometers. Furthermore, he measures 12 cell with 2 micrometer.

In order to calculate the average measurements of the cells Matt had, you take into account that the total number of cells is 20. Then, you have:

avg = (8(3) + 12(2))/ (8+12) = (24 + 24)/20 = 48/20

avg = 24/10 = 12/5 = 2.4

Then, the average of the measurements of Matt was 2.4 micrometers